No one in the comments seems to point out: all of your needs and wants are being met, but the fact that she sought an external relationship indicates that her needs and wants are not being met.
If you’re ok with the cheating and want to keep her, you probably need to look into why she feels she isn’t getting what she needs at home (which as others have mentioned, is ok if you’re both open to an open marriage!)
I’m sorry she wasn’t open with you about her needs being met, and I’m sorry she went behind your back to meet them. I hope you’ll both be ok, man.
Is it comparable to today’s oatmeal? Is porridge a separate food from oatmeal?